Its easy to pull apart, but difficult to be constructive at the same time, unless there is some background/intent, to measure your achievement.

My instant thought was....very little, but theres nothing to go on, it always seems a little unfair to critique this type of shot, which obviously means more to you than to a casual passing critique arsehole like me.

I agree. To me there is nothing to the shot, Mazda is underexposed and slightly out of focus. also the tail iend of this car is nothing exotic,maybe the same shot on an lamborguihni (spelled wrong) or ferrari would be nicer but to me this shot really has nothing to it, maybe a car fanatic would be think differently though,to each his own.

Meh, it is my favorite car, and folks on the Mazda forum are crazy about it idk, maybe this is the wrong place and as a stand alone photo, it's nothing.

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Nope, its not wrong to seek critique for a photo you took.
Don't go to Mazda owners club forums for photo critique, they're clearly bonkers, they'll tell you its the dogs ******** and expect you to retire on the proceeds.
Back in the real world, where fuzzy boot lids don't cut the custard, you can get an honest, relatively un-biased opinion and help on how to improve you photography.
Mazda < Photography

I agree it's too dark.
The major problem I see though, is that you have focused on the M with the lens wide open. If you wanted to shoot wide open, (which is how I shoot most times), you want to focus on the Z instead of the M.
Hope that helps.
BTW-I like the colors here.